Improvement in the manufacture of bolts



. improvement.

lUNITED STATES PATENT @Errea WILLIAM J. LEWIS, OFPITTSBUBG,PENNSYLVANIA.

IMPROVEMENT IN THE NIANUFACTURE OF BOILTS.

Specification forming part of Letters Patent No. 172,459, dated January18, 1876; application filed October 20, 1875.

' like parts- Figure l is a view in perspective of the operative ends ofa set of dies illustrative of my Fig. 2 is a perspective view of a platefrom which the bolt-blanks are severed. Fig. 3 is a like view of one ofthe blanks, as out. Fig. 4 shows a blank headed. Fig. 5 illustrates thenext step of a rounded stem. Fig. 6 shows the finished article, and Fig.7 shows the gripingdies of Fig. l, made with V-sbaped, instead ofsquare, grooves.

My improvement relates to the manufacture of bolt-blanks and bolts, andmore particularly carriage-bolts, by severing the blank from the end oredge of a metallic plate, and compressing a round stem and upsetting ahead thereon.

In carrying out my invention I roll out, or make by suitable means, aplate of any desired thickness, according to'tlie size of blank desired.Such plate I trim or divide in the manner ordinarily practiced inpreparing nailplates, but in such manner as to give a plate, A, oneedge, a, of which will be of, any desired length, and ordinarily aboutas long as the bolt B to be made. In cutting these plates, Where thematerial is a fibrous metal,

the edge a, from which the blanks are out, preferably runslongitudinally with the fiber; but where the metal is noniibrous, orhomogeneous, or is brous only to a slight degree, it makes little, ifany, difference from which edge of the plate the blanks are cut. I thencut or shear, or otherwise sever, the blanks B from the parent bar orplate by the use of any suitable devices for that purpose, severing theblank so that its cross-section shall be a square or nearly so.

When making blanks for carriage or screw bolts I make the plate A (ingeneral terms) of a thickness equal to one sideof the square of theshank b, and equal, or about equal, to the diameter of the rounded sternb', or to the diameter of a circle inscribed within the square of theshank b. Also, in such case I cut off for each blank a Width of materialequal, or about equal, to the thickness of the plate, and lalso out theblank so that it shall be of uniform size through so much and such partof its length as goes to form the body of the stem, or of the shank andstem. Such blanks are then, or by one or more subsequent operations,caught byor placed within side gripingdies I) D of any suitableconstruction, with reference to giving tbe-desired forni to tbe ste-m bor shank b, and by one or more simultaneous or consecutive actions ofsuch dies, while the shank b retains the form in cross-section of theblank, with but little, if any, change, the stein b may be rounded, asshown, these functions being secured by the round and rectangular or Vgrooves d ol'. The projecting end of the blank is then, or previously,upset into a head, b2, by a header, D2, or by other suitable dies, suchas are einployed in bolt-heading operations. In this Way I produce, bymechanical means, the bolt B1, of Fig. 5, and only need to out thethread and add a nut to produce the linished article B3, shown in Fig.6. By varying the forni of the groove d d any desired irregular or angular shape may be given to the shank or stem b b1.

While I have shown the dies D Dl for purposes of illustration I do notin the mode of manufacture described limit myseltl specifically to thesedies, nor to the conjoint action on 'the blank of these or other dies oflike funcmade of uniform size to the extent abovel stated, and'headed,as in Fig. 4, by side grip- I claim as my inventiony 1. As animprovement in the art of making screw-bolts, severing the rectangularblank from the edge or end of a metallic plate, forming a head thereon,and shaping a rounded stem by lateral compression lin dies or other#Wise, substantially as described.

2. A headed bolt-blank, B4, made as described, and possessingsubstantially the characteristics specified, with reference to Fig. 4.In testimony whereof I have hereunto set my hand.

WILLIAM J. LEWIS.

Witnesses:

C. E. MILLIKEN, GEO. H. GHRIsTY.

